Improvement in spark-arresters



J. L. FERRIS;

Spark-Arrest'ers. y

`No. 144,081. l Patented oct. 28,1873.

U. 0 OOO ecco o0 o UNITED STATES PATENT OFFICE.

JAMES L. FERRIS, OF SOUTH BRUNSWICK, ASSIGNOR TO HIMSELF AND ISAAC S.BUGKALEW, OF JAMESBUBG, NEW JERSEY.

IMPROVEMENT lN` SPARK-ARRESTERS.

Specification forming part of Letters Patent No. 144,081s dated October28, 1873; application led February 21, 1873.

To all 'whom it may concern:

Be it known that I, J AMES L. FEEEIs, of South Brunswick, Middlesexcounty, New Jersey, have invented an Improvement in Spark- Arresters, ofwhich the following is a speciiication:

My invention relates to that class of sparkarresters on which aperforated screen or plate,

`situated across the shell of the boiler, between the rear tube sheetand the chimney, is the prominent feature, an example of such asparkarrester being shown in the Patent No. 129,274, granted to me J nly16, 1872.

My present invention, which is an improvement on that described in thesaid patent, has for its object economy in construction and greaterstrength and rigidityT than in sparkarresters of this class, obiectswhich I attain by placing a .corrugatedperforated plate, E, in thesmoke-chamber D, of a tubular boiler, between the rear tube-sheet B andthe chimney O, as shown in the vertical section, Fig. 1,

- and plan View, Fig. 2, of the accompanying drawing.

A represents the rear portion of the shell of a locomotive-boiler,within which, between the rear tube-sheet B and the chimney C, I securethe corrugated plate E, which fits snugly in and is rmly'secured to thesaid shell, theV plate being perforated throughout, so Aas to permit thefree escape of the gaseous products of combustion, while all, exceptingthe more minute sparks, are arrested, and falling onto the bottom of theshell of the boiler may be removed therefrom from time to timethrough asuitable opening provided with a door or valve,'as shown in Fig. l.

One of the main advantages of my present invention is the strength ofthe perforated screen or plate E, which, being formed into a series ofparallel corrugations united to the shell of the boiler, presents asystem of rigid pose specified.

JAMES L. FERRIS.

Witnesses:

J AivrEs T. GRAHAM, T. B. MosHEE. 1'

